 define([
    "jquery"
], function($) {
	jQuery.extend({
	    createUploadIframe: function(id, uri)
		{
				//create frame
	            var frameId = 'jUploadFrame' + id;
	            var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
				if(window.ActiveXObject)
				{
	                if(typeof uri== 'boolean'){
						iframeHtml += ' src="' + 'javascript:false' + '"';

	                }
	                else if(typeof uri== 'string'){
						iframeHtml += ' src="' + uri + '"';

	                }
				}
				iframeHtml += ' />';
				jQuery(iframeHtml).appendTo(document.body);

	            return jQuery('#' + frameId).get(0);
	    },
	    createUploadForm: function(id, fileElementId, data)
		{
			//create form
			var formId = 'jUploadForm' + id;
			var fileId = 'jUploadFile' + id;
			var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
			if(data)
			{
				for(var i in data)
				{
					jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
				}
			}
			var oldElement = jQuery('#' + fileElementId);
			var newElement = jQuery(oldElement).clone();
			jQuery(oldElement).attr('id', fileId);
			jQuery(oldElement).before(newElement);
			jQuery(oldElement).appendTo(form);



			//set attributes
			jQuery(form).css('position', 'absolute');
			jQuery(form).css('top', '-1200px');
			jQuery(form).css('left', '-1200px');
			jQuery(form).appendTo('body');
			return form;
	    },

	    ajaxFileUpload: function(s) {
	        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
	        s = jQuery.extend({}, jQuery.ajaxSettings, s);
	        var id = new Date().getTime()
			var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data));
			var io = jQuery.createUploadIframe(id, s.secureuri);
			var frameId = 'jUploadFrame' + id;
			var formId = 'jUploadForm' + id;
	        // Watch for a new set of requests
	        if ( s.global && ! jQuery.active++ )
			{
				jQuery.event.trigger( "ajaxStart" );
			}
	        var requestDone = false;
	        // Create the request object
	        var xml = {}
	        if ( s.global )
	            jQuery.event.trigger("ajaxSend", [xml, s]);
	        // Wait for a response to come back
	        var uploadCallback = function(isTimeout)
			{
				var io = document.getElementById(frameId);
	            try
				{
					if(io.contentWindow)
					{
						 xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
	                	 xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;

					}else if(io.contentDocument)
					{
						 xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
	                	xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
					}
	            }catch(e)
				{
					jQuery.handleError(s, xml, null, e);
				}
	            if ( xml || isTimeout == "timeout")
				{
	                requestDone = true;
	                var status;
	                try {
	                    status = isTimeout != "timeout" ? "success" : "error";
	                    // Make sure that the request was successful or notmodified
	                    if ( status != "error" )
						{
	                        // process the data (runs the xml through httpData regardless of callback)
	                        var data = jQuery.uploadHttpData( xml, s.dataType );
	                        // If a local callback was specified, fire it and pass it the data
	                        	s.success && s.success( data, status );

	                        // Fire the global callback
	                        	s.global && jQuery.event.trigger( "ajaxSuccess", [xml, s] );
	                    } else
	                        jQuery.handleError(s, xml, status);
	                } catch(e)
					{
	                    status = "error";
	                    jQuery.handleError(s, xml, status, e);
	                }

	                // The request was completed
	                if( s.global )
	                    jQuery.event.trigger( "ajaxComplete", [xml, s] );

	                // Handle the global AJAX counter
	                if ( s.global && ! --jQuery.active )
	                    jQuery.event.trigger( "ajaxStop" );

	                // Process result
	                if ( s.complete )
	                    s.complete(xml, status);

	                jQuery(io).unbind()

	                setTimeout(function()
										{	try
											{
												jQuery(io).remove();
												jQuery(form).remove();

											} catch(e)
											{
												jQuery.handleError(s, xml, null, e);
											}

										}, 100)

	                xml = null

	            }
	        }
	        // Timeout checker
	        if ( s.timeout > 0 )
			{
	            setTimeout(function(){
	                // Check to see if the request is still happening
	                if( !requestDone ) uploadCallback( "timeout" );
	            }, s.timeout);
	        }
	        try
			{

				var form = jQuery('#' + formId);
				jQuery(form).attr('action', s.url);
				jQuery(form).attr('method', 'POST');
				jQuery(form).attr('target', frameId);
	            if(form.encoding)
				{
					jQuery(form).attr('encoding', 'multipart/form-data');
	            }
	            else
				{
					jQuery(form).attr('enctype', 'multipart/form-data');
	            }
	            jQuery(form).submit();

	        } catch(e)
			{
	            jQuery.handleError(s, xml, null, e);
	        }

			jQuery('#' + frameId).load(uploadCallback	);
	        return {abort: function () {}};

	    },

		handleError: function (s, xhr, status, e){
			if(s.error){
				s.error.call(s.context || s, xhr, status, e);
			}
			if (s.global) {
				(s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);
			}
		},

	    uploadHttpData: function( r, type ) {
	        var data = !type;
	        data = type === "xml" || data ? r.responseXML : r.responseText;
	        // If the type is "script", eval it in global context
	        if ( type === "script" )
	            jQuery.globalEval( data );
	        // evaluate scripts within html
	        if ( type === "html" )
	            jQuery("<div>").html(data).evalScripts();

	        return data;
	    }
	})
});